Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments - Other Off-Balance Sheet Arrangements (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Loans Sold With Recourse [Member]	Dec. 31, 2011 Loans Sold With Recourse [Member]
Other off-balance sheet arrangements - supplemental information [Abstract]
Indemnification Agreements Loan Sale And Securitization Loans Sold With Recourse Contractual Amount			$ 10,200,000,000	$ 10,400,000,000
Indemnification Agreements, Loan Sale and Securitization, Loans Sold with Recourse: Carrying Value			142,000,000	148,000,000
Other Noninterest Expense	$ 4,832,000,000	$ 2,943,000,000